Question: Detailed explanation please. A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are in control

Detailed explanation please.
A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard to a particular quality attribute. Accordingly, she inspected 1,000 units of output from each machine in random samples, with the following results What are the control chart upper and lower control limits for an alpha risk of .05 ? (Hint: the alpha level is given for 2 sides; so, each side has a half of 0.05 . ) .0272and.0128.0287and.0113.029and.013.0303and.0097.0332and.0068
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